Improvement in dies for heading bolts



IUNITED STATES PATENT OFFICE.

CHARLES KANE, 0F PITTSBUBG, PENNSYLVANIA.

IMPROVEMENT IN DIES FOR HEADING BOLTS.

Specification forming part of Letters Patent No. 54,738, dated May l5, 1866.

To all whom it may concern:

Be it known that l, CHARLES KANE, of the city of Pittsburg, in the county of Allegheny, in the State of Pennsylvania, have invented a new and Improved Combination of Dies for Pressing Square-Head Bolts; and I do hereby declare that the following is a full and exact description thereof, reference heilig had to the accompanying drawings, in which- Figure l represents a perspective view of part of the bolt-press, showing the relative po sition of the different dies. Fig. 2 is a view ot' the pressing-dies and ot' the griping-dies in elevation, seen from the back of the press. Fig. 3 is a similar view of the dies now in use. Fig. 4 is a sectional view through the line A B ofthe set of dies now in use, with a boltjust pressed. Fig. 5 is a similar view through the line C D of my improved dies. Fig. 6 is an end view ofa bolt pressed in Fig. 4. Fig. 7 is an end view of a bolt pressed by the old dies, Fig. 4, transferred to that part of the drawing to illustrate its relation with the pressingdies on the second operation. Fig. S is an end view of a bolt pressed by my improved dies in Fig. 5; and Fig. 9 isa modification of my dies K a-nd L, which can be used in their place and made to answer the same purpose.

My invention consists in a combination of dies so constructed as to insure the staving of heads of bolts being always in the center of the bolt, whereby the fibers o'f the iron are not destroyed and the bolt is made much superior in strength and neatness than any non7 made by machinery, as they can liever be galled in my improved dies.

To enable others skilled in the art to make and use my invention, I will proceed to describe it in detail.

E is the debed plate. F is the stationary head. Gis the movable head ot' the gripingdies and pressin g-dies. H is the movable head of the staving and heading dies. I is the stationary griping-die. J is the movable griping-die. K is the stationary pressing-die. L is the movable pressing-die, and M is the staving and heading die, plunger, or snap.

Before proceeding farther with the description of mytniprovement I will describe the combination of dies now in use in the boltpresses, in order to illustrate the diierence between them anchmy improved set of dies.

p place.

In the bolt-presses now in use, O andP are the pressing-dies, R and S are the gripingdies, and T is the staver or header. When the griping-dies are closed as in Fig. 3, the two pressingdies P and O are brought near each other, and only leaving between their ends the space o p, equal to the side of the square head desired, so that when the staver T comes forward and staves the heated bar it is impossible for the heated iron to spread sidewise, as it is contlned on both sides; but, as it is not confined top and bottom, if the iron is in the slightest degree hotter on one side than on the other, it is staved all on one side, and as is represented by Figs. 4 and 6. N ow, when the piece of iron is turned one-quarter round, as in Fig. 7, to be placed once more in the dies and held fast by the griping-dies, the projection Q will strike the die I), and the iron will be driven inthe direction of the arrow; but, as the round part of the iron is held stationary in the griping-dies, the bers of the iron will be strained or destroyed by the displacement ofthe head which takes place, and the bolt is what is termed galled In my improved combination of dies the pressingdies K L are made with ledges or projections U V. These ledges or projections are either made all of one piece with the die, or they are made separate and rmly held in This is a thing optional with the constructor ot' the machines, and can be made one way or the other but they are so proportioned or placed that when the griping-dies I J are closed, Fig. 2, the pressing-dies will leave bctween them a parallelopipedic space, in which the heading-die M will work as close as possible, the distance 7c l being equal to the side ot' the square head desired, and the distance between the two ledges U and V is a little longer, so thatif a figure were drawn with these two distances as measure for two of the sides, and they were placed at right angles, it wouldform a parallelogram having its breadth equal to the square of the head desired, and its length greater.

The plunger or staver has for cross-section precisely the parallelogram above referred to, and it works in between the faces of the dies K and L and the ledges U and V as a piston.

The operation in my combination ot' dies is as follows: The dies being open, a heated bar of iron is introduced between the griping-dies, which gripe it in the usual way. The stavingdie or plungerMnow comes forward and staves the metal in all directions; but as it is conned on the four sides it cannot be staved crooked or lop-sided, as in the machines now in use. The iron is shaped as in Figs. 5 and 8, having the side XY of the desired dimension and the side Y Z a little larger, allowing1 of it being perfected by the next operation of the pressing-dies, as by turning it one-quarter around the dies L K, in coming together, will form the head perfectly square.

I do not confine my claim to the angle at which the pressing and confining surfaces are placed relatively to the center of motion of the dies, as this is not material to the successful working of the principle.

The dies represented by the figure 9, which can be solid dies with planes at forty-five degrecs with the center of motion ot the dies, will answer to work my improvement. They can be solid dies having a V cut at their end, orfo'ur dies, A B C D, arranged in combination with each other.

I do not wish to be understood as claiming any novelty in dies for pressing bolt-heads either with plane surfaces at right angle with the center of motion or with plane surfaces at n forty-five degrees with the center of motion, as I know they have been used; but in one case they are used to conne the metal only on two of its sides, and in the other they are formed so as to leave a square space between them, leaving no room for expansion and excess of heated metal, which in one case is the cause of the galling of the bolt and in the other of forming an imperfect square head.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is-

The heading or staving die M, when its cross-Section is a parallelogram, in combination and made to correspond with and fit a rectangular space left between the pressing-dies, the dimension ot' which is greater from ledge to ledge, as above described.

oHAELEs KANE. [1.. s]

Witnesses H. l?. GENGEMBRE, A. L. FLEURY. 

